springdetector.java

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//: c11:SpringDetector.java
// What will the weather be?
// From 'Thinking in Java, 3rd ed.' (c) Bruce Eckel 2002
// www.BruceEckel.com. See copyright notice in CopyRight.txt.
import com.bruceeckel.simpletest.*;
import java.util.*;
import java.lang.reflect.*;

public class SpringDetector {
  private static Test monitor = new Test();
  // Uses a Groundhog or class derived from Groundhog:
  public static void
  detectSpring(Class groundHogClass) throws Exception {
    Constructor ghog = groundHogClass.getConstructor(
      new Class[] {int.class});
    Map map = new HashMap();
    for(int i = 0; i < 10; i++)
      map.put(ghog.newInstance(
        new Object[]{ new Integer(i) }), new Prediction());
    System.out.println("map = " + map + "\n");
    Groundhog gh = (Groundhog)
      ghog.newInstance(new Object[]{ new Integer(3) });
    System.out.println("Looking up prediction for " + gh);
    if(map.containsKey(gh))
      System.out.println((Prediction)map.get(gh));
    else
      System.out.println("Key not found: " + gh);
  }
  public static void main(String[] args) throws Exception {
    detectSpring(Groundhog.class);
    monitor.expect(new String[] {
      "%% map = \\{(Groundhog #\\d=" +
      "(Early Spring!|Six more weeks of Winter!)" +
      "(, )?){10}\\}",
      "",
      "Looking up prediction for Groundhog #3",
      "Key not found: Groundhog #3"
    });
    }
} ///:~